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item_timefunc.cc:

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CAST now always return a well-formed character string.


sql/item_timefunc.cc:
  CAST now always return a well-formed character string.
This commit is contained in:
unknown
2005-01-27 14:51:16 +04:00
parent 513a70a34b
commit 199a139da1
1 changed files with 12 additions and 5 deletions
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17
sql/item_timefunc.cc
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@ -2115,7 +2115,6 @@ String *Item_char_typecast::val_str(String *str)
String *res;
uint32 length;
#if 0
if (!charset_conversion)
{
if (!(res= args[0]->val_str(str)))
@ -2125,7 +2124,6 @@ String *Item_char_typecast::val_str(String *str)
}
}
else
#endif
{
// Convert character set if differ
uint dummy_errors;
@ -2163,9 +2161,18 @@ String *Item_char_typecast::val_str(String *str)
void Item_char_typecast::fix_length_and_dec()
{
uint32 char_length;
charset_conversion= !my_charset_same(args[0]->collation.collation, cast_cs) &&
args[0]->collation.collation != &my_charset_bin &&
cast_cs != &my_charset_bin;
/*
We always force character set conversion if cast_cs
is a multi-byte character set. It garantees that the
result of CAST is a well-formed string.
For single-byte character sets we allow just to copy
from the argument. A single-byte character sets string
is always well-formed.
*/
charset_conversion= (cast_cs->mbmaxlen > 1) ||
!my_charset_same(args[0]->collation.collation, cast_cs) &&
args[0]->collation.collation != &my_charset_bin &&
cast_cs != &my_charset_bin;
collation.set(cast_cs, DERIVATION_IMPLICIT);
char_length= (cast_length >= 0) ? cast_length :
args[0]->max_length/args[0]->collation.collation->mbmaxlen;